" comment key map:
"nmap ** <Esc>:.s!^\(\s*\)\(.*\)$!\1// \2!<CR>==
"vmap ** :s!^\(\s*\)\(.*\)$!\1// \2!<CR>==
"nmap && <Esc>:.s!\(\s*\)//\(.*\)$!\1\2!<CR>==
"vmap && <Esc>:s!\(\s*\)//\(.*\)$!\1\2!<CR>==
